io.druid.segment

Class NilColumnValueSelector

java.lang.Object

io.druid.segment.NilColumnValueSelector

All Implemented Interfaces:

HotLoopCallee, BaseDoubleColumnValueSelector, BaseFloatColumnValueSelector, BaseLongColumnValueSelector, BaseObjectColumnValueSelector, ColumnValueSelector

public final class NilColumnValueSelector
extends Object
implements ColumnValueSelector

Represents "absent" column.

Method Summary

Modifier and Type	Method and Description
Class	classOfObject() Returns Object.class.
double	getDouble() Always returns 0.0.
float	getFloat() Always returns 0.0f.
long	getLong() Always returns 0L.
Object	getObject() Always returns null.
void	inspectRuntimeShape(RuntimeShapeInspector inspector) Implementations of this method should call inspector.visit() with all fields of this class, which meet two conditions: 1.
static NilColumnValueSelector	instance()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

instance

public static NilColumnValueSelector instance()

getDouble

public double getDouble()

Always returns 0.0.

Specified by:

getDouble in interface BaseDoubleColumnValueSelector

getFloat

public float getFloat()

Always returns 0.0f.

Specified by:

getFloat in interface BaseFloatColumnValueSelector

getLong

public long getLong()

Always returns 0L.

Specified by:

getLong in interface BaseLongColumnValueSelector

getObject

@Nullable
public Object getObject()

Always returns null.

Specified by:

getObject in interface BaseObjectColumnValueSelector

classOfObject

public Class classOfObject()

Returns Object.class.

Specified by:

classOfObject in interface BaseObjectColumnValueSelector

inspectRuntimeShape

public void inspectRuntimeShape(RuntimeShapeInspector inspector)

Description copied from interface: HotLoopCallee

Implementations of this method should call inspector.visit() with all fields of this class, which meet two conditions: 1. They are used in methods of this class, annotated with CalledFromHotLoop 2. They are either: a. Nullable objects b. Instances of HotLoopCallee c. Objects, which don't always have a specific class in runtime. For example, a field of type Set could be HashSet or TreeSet in runtime, depending on how this instance (the instance on which inspectRuntimeShape() is called) is configured. d. ByteBuffer or similar objects, where byte order matters e. boolean flags, affecting branch taking f. Arrays of objects, meeting any of conditions a-e.

Specified by:

inspectRuntimeShape in interface HotLoopCallee